Here's what Omnium has to say:

An easy way to attach an Apple AirTag under your Omnium Cargo or Mini-Max.

Useful as an additional security measure in case of theft, or simply just a way to keep an eye on your bike.

Durable plastic, stainless fixtures, just 26g.

• • • Housing is made from plastic, bolt and washer is stainless steel and requires 5mm Allen key for installation
    • Designed manufactured in Germany by Momentum Goods
    • Weight: 26g